Multiple-cylinder grinder



Dec. 24, 1929. M. c. HUTTO MULTIPLE CYLINDER GRINDER Filed Aug. 9, 1925 0 7 m H. m0 m M %m Y.

Patented Dec; 24, 1929 PATENT OFFICE mnsnnn 0. Hume, on nnrnorr, mrcnrean MULTIPLE-CYLINDER enmnnn Application filed August 9, 1926. Serial No. 128,024.

l vide a plurality of independently adjustable cylinder grinders adapted to be connected to gether by yokes of different lengths by which the distance apart of the grinders may be varied.

2o These objects and the several novel features of the inventionare hereinafter more fully described and claimed and the preferred form. of construction by which these obj ects are attained is shown in the aocompanylng 2 drawings in whichi Fig. 1 is a longitudinal section through a double ended cylinder grinder embodying my invention. t Fig. 2 is an enlarged section taken on 3 line 22 of Fig. 1.

The grinder comprises a yoke or connector 1 having threaded ends 2. tubular body member 3 is threaded onto one end of the yoke 1 and a similar body member A is threaded 35 onto the opposite end of the yoke 1. These body members 3 and 4 are each provided with a series of three longitudinal slots in which the stone holders 5 are positioned as shown in Fig. 2. Extending longitudinally of each body member. is a shaft 6 which at one end is threaded into a cone 7. This cone is movable longitudinally of the respective body member and a dowel pin 8 is provided extending through the respective body-member and as ngaging in a keyway provided therefor 1n the cone to prevent the cone from rotating in the body. A cone 9 is rotatably mounted on the opposite end of each shaft 6 and a knob 10 is secured to the shaft 6 at the left of Fig. 1 while the shaft 6 at the right end of Fig. 1 is provided with an enlarged head 11 having a screw driver slot by which the shaft may be turned. The stone holders 5 are preferably formed from die cast metal and are provided with angular faces 12 which fit the faces of the cones 7 and 9. A grinding stone 13 is embedded in each stone holder 5 and the stone holders are held in position in the several slots by means of annular coiled springs 145 fitting the annular grooves 15 in the body members and notches 16 in the stone holders 5. In this manner the stone holders are properly seated on the cones so that as the cones are drawn together the stone holders and grinding stones are moved radially outwardly. The body mend her 3 at the right of Fig. 1 is provided with an enlarged cup shaped end 17 having a bayonet notch 18 therein into which a driving member may be inserted for rotating the en tire double ended grinder.

This device is utilized for simultaneously grinding two cylindrical apertures in alignment and to an exact diameter and for the purpose of illustration T have shown two bushings 19 in which the apertures therethrough may be ground in alignment. The tool is first positioned in the bushings 19 asshown in Fig. 1 it being understood that the bushings 19 are to be held in a fixed support so that they cannot move. At this time by inserting a screwdriver in the slotted head 11 at the right of Fig. 1 the shaft 6 may be threaded into the cone 7 thus drawing toward each other to move the stone holders outwardly until the grinding stones contact the inner wall of the aperture to be ground. It is to be noted that both cones 7 and 9 and the shaft 6 are movable freely longitudinally of the central bore 20 of the body member. This provides a floating action of the cones so that the pressure is evenly distributed over .the cones thus allowing the grinding stones to be evenly expanded. At the opposite end the hurled knob 10 may be turned which turns the respective shaft 6 and threads it into the respective cone 7 thusdrawing the cones together and expanding the grinding stones in the same manner as at the opposite end of Fig. 1. At this time the driving memher may be engaged in the notch 18 for rotating the entire grinder in the bushings 19. As the device is rotated it should also be moved back and forth longitudinally so that the grinding stones grind'the entire inner surface of the bushings. As the grinding stones begin to free themselves they may be expanded further by rotation of the knob 10 and the screw head 11 until the bushings are ground to size. At this time the knob 10 and screw head 11 are turned in the opposite direction to unthread the shafts 6 from .the cones 7 thus allowing the cones to move apart under pressure by the coiled springs 14: which also r .tend to firmly seat the stone holders on the cones. This reduces the diameter of the grinding stones and the entire device may be then Withdrawn from the bushings. Yokes or connectors 1 of different lengths may be used depending upon the distance apart of the apertures to be ground and these yokes may be readily removed and replaced by means of the threaded ends 2. I have described the members 13 as grinding stones but these may be abrasive or cutting devices for Wearing away or cutting the metal to an exact diameter.

Although the drawings illustrate an apparatus in which two grinder bodies are shown, each of which is provided with abrasive members or grinding stones for working the cylindrical surface of a bushing, it is to be understood that this invention is not limited in its use to a tool having two grinder units, but is intended to comprehend a tool of this jacent ody members, and means arranged on each of said body members for positively radially adjusting the stones thereon independently of the adjustment of the stones on another body member.

2. A grinder for simultaneously grinding a plurality of cylinders in axial alinement,

comprising a plurality'of body members arranged axially in line and each adapted -to.

operate on one of said cylinders; grinding stones mounted on each of said body members and adapted to work on the bore of one of said cylinders independently of the work of the stones of another body member on another cylinder, a yoke rigidly connecting the opposing, ends of adjacent body members, and adjusting means for positively adjusting the stones radially on each body member independently of the radial adjustment of stones on another body member, the adjusting means for said stones being accessible at the outer ends of said body members.

In testimony whereof I sign this specification. 7

MARSDEN C. HUTTO.

character havinga plurality of such grinding units.

The bushings 19, 19, are intended to represent generally two cylindrical surfaces of any structure in which these two surfaces are arranged in definite relation to each other; These surfaces are represented in Figure 1 as formed in the two sleeves 19, 19, and these are maintained in a definite relation relative to each other, so that they are practically lntegral, by means of a frame consisting in the present case of a base 21 and two pedestals 22 rising from opposite ends of this base,

each containing an opening which receives one of the bushings 19.

From the foregoing description it becomes evident that the device is very simple and eflicient in operation, will not easily get out of order, provides a means for simultaneously grinding two spaced apertures in alignment and to an exact diameter and provides a device which accomplishes the objects described.

Having thus fully described my invention, its utility and mode of operation, what ll claim "and desire to secure by Letters Patent of the United States is- 1. A grinder for simultaneously grinding a plurality of cylinders in axial alinement, comprising a plurality of body members ar- 

